Thyroid Tests

What Is Thyroid Disease?

Some diseases of the thyroid or pituitary gland cause the thyroid to make too much or not enough thyroid hormone:

• If the thyroid is overactive, it releases too much thyroid hormone, causing . The body use up energy more quickly than it should, and chemical activity (like metabolism) in the cells speeds up. Symptoms include sweating, trembling, weight loss, and fast heartbeat.
• If the thyroid is underactive, it makes too little thyroid hormone, causing . The body uses up energy more slowly, and chemical activity (metabolism) in the cells slows down. Symptoms include tiredness, feeling cold, constipation, dry skin, and slow height growth in children.

What Are Thyroid Blood Tests?

Doctors use blood tests to check for thyroid or pituitary problems. In kids already diagnosed with thyroid or pituitary problems, the tests are used to guide treatment.

Commonly ordered thyroid blood tests include:

• T4 test: This is done to measure the blood level of the hormone T4 (thyroxine). It might be done in one or both of the following ways:
  • total T4, which measures the entire amount of thyroxine in the blood, including the amount attached to blood proteins that help carry the hormone through the bloodstream
  • free T4, which measures only the thyroxine that's not attached to proteins. This is the part of T4 in the blood that affects how the body's cells work.
    The results of the T4 blood tests can help diagnose hyperthyroidism or hypothyroidism and guide treatment.
• TSH test: A thyroid stimulating hormone (TSH) test can help tell how well the thyroid is working. If a thyroid disease prevents the gland from making enough thyroid hormone, the pituitary gland releases more TSH into the blood. If the thyroid is making too much thyroid hormone, the pituitary releases less TSH, which can lower the levels of TSH in the blood.
• T3 total test: The T3 total test measures the other major thyroid hormone in the blood. It often helps doctors diagnose hyperthyroidism.
• thyroid antibodies test: Hashimoto's thyroiditis is an autoimmune condition in which the immune system attacks the thyroid gland. To diagnose it, doctors check for high levels of antibodies that are a sign of the immune system's attack on proteins in the thyroid gland. Usually, two types of thyroid antibodies are measured: thyroglobulin antibodies (TgAb) and thyroid peroxidase antibodies (TPO).

In some cases, abnormal thyroid test results can be due to a medicine, an ongoing medical condition, or pregnancy. In these cases, there may be nothing wrong with the thyroid or pituitary glands themselves.

The normal ranges of thyroid function test results vary by age. Doctors think about this carefully when they interpret them.

What if I Have Questions?

If you have any questions about a thyroid blood test, speak with your doctor. You can also talk to the technician who's doing the blood draw before the procedure.